High Amp service

[Electriman]

Greetings,

I am putting a 2000 A service for a industrial building. I would like to use 6 disconnect rule to avoid using a 2000A service disconnect. The utility is going to put a 1500 KVA transformer to feed the building. I am going to tied to the secondary of the transformer. Is it ok to use 6 disconnect rule in here or do I have to put a 2000A service disconnect for transformer secondary protection?

Thanks for advice.

 

[ptonsparky]

You don’t need to worry about the POCO transformer. That is their problem.

What code cycle are you under? 2020 has removed the six disconnect allowance.

This project should have EE somewhere, unless you’re like Nebraska. What are in the specs?

 

[electrofelon]

You don’t need to worry about the POCO transformer. That is their problem.

What code cycle are you under? 2020 has removed the six disconnect allowance.

It only removed 6 disconnects in a common enclosure such as panel board or switchboard. He could still use 6 separate circuit breaker enclosures or safety switches. No sure about the economics of doing that, in fact in a recent thread I asked if anyone had priced doing it that way. I would guess it would still be worth it since you would be buying those circuit breakers anyway.

 

[ptonsparky]

It only removed 6 disconnects in a common enclosure such as panel board or switchboard. He could still use 6 separate circuit breaker enclosures or safety switches. No sure about the economics of doing that, in fact in a recent thread I asked if anyone had priced doing it that way. I would guess it would still be worth it since you would be buying those circuit breakers anyway.

Correct, I keep forgetting that detail.

 

[Electriman]

Ok Thanks. I am still under NEC 2017. But even NEC 2020 wants a single main just for residential and commercial buildings not industrial building, am I right?

 

[ptonsparky]

You may have more than one service disconnect in all of those locations. They need to be grouped in the same location, with exceptions. Article 230.
230.70(A) and while you’re in the area 230.71(B).

 

[sw_ross]

It only removed 6 disconnects in a common enclosure such as panel board or switchboard. He could still use 6 separate circuit breaker enclosures or safety switches. No sure about the economics of doing that, in fact in a recent thread I asked if anyone had priced doing it that way. I would guess it would still be worth it since you would be buying those circuit breakers anyway.

Can you link to that thread?
im in a similar situation with an existing 600 amp service that will potentially have an increase in load and with probably have a second 600 amp panel installed.

The existing 600 amp panel would have to have a disconnect mounted on the exterior of the building, and a second 600 amp service disconnect would be added beside it to feed the second 600 amp panel inside the mechanical room. The existing 600 amp panel would need to be converted to a sub-panel instead of a service .

I’m looking at my options and would like to read your other thoughts in the other thread.
Thanks

 

[electrofelon]

Can you link to that thread?
im in a similar situation with an existing 600 amp service that will potentially have an increase in load and with probably have a second 600 amp panel installed.

The existing 600 amp panel would have to have a disconnect mounted on the exterior of the building, and a second 600 amp service disconnect would be added beside it to feed the second 600 amp panel inside the mechanical room. The existing 600 amp panel would need to be converted to a sub-panel instead of a service .

I’m looking at my options and would like to read your other thoughts in the other thread.
Thanks

I don't quite follow. Why do you want to move the disconnects outside?

Here is that thread:

Options in lieu of MLO service panelboards

So I think we all know that MLO service panelboards are now prohibited under the 2020 NEC. Couple of questions: 1. The wording for meter centers is a little different where "separate compartments" are allowed where for panelboards, its "separate enclosures". Has anyone heard of any...

forums.mikeholt.com

 

[ptonsparky]

Can you link to that thread?
im in a similar situation with an existing 600 amp service that will potentially have an increase in load and with probably have a second 600 amp panel installed.

The existing 600 amp panel would have to have a disconnect mounted on the exterior of the building, and a second 600 amp service disconnect would be added beside it to feed the second 600 amp panel inside the mechanical room. The existing 600 amp panel would need to be converted to a sub-panel instead of a service .

I’m looking at my options and would like to read your other thoughts in the other thread.
Thanks

Article 230 is what you want to brush up on.